Okay, i've no kids of my own or anything, but since i'm a student of TKD myself and wanted to chime in.
The children's group of my school isn't extremely serious and kids get an opportunity to joke and play during training. They usually train before the adult group and it's great fun to see them playing around and playfighting with the trainer after official practice ended. It gives them a release for their energy and possible frustration, so they're less likely to get agressive in school or anything.
Even if he does have a problem keeping his head on the training, if he really enjoys it he'll develop more focus and serious attitude in no time.
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